[PATCH 3.14 36/66] Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code

From: Greg Kroah-Hartman
Date: Tue Jul 15 2014 - 19:57:37 EST

3.14-stable review patch. If anyone has any objections, please let me know.


From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>

commit affb1aff300ddee54df307812b38f166e8a865ef upstream.

Starting with Win8, we have implemented several optimizations to improve the
scalability and performance of the VMBUS transport between the Host and the
Guest. Some of the non-performance critical services cannot leverage these
optimization since they only read and process one message at a time.
Make adjustments to the callback dispatch code to account for the way
non-performance critical drivers handle reading of the channel.

Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/hv/connection.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -319,9 +319,13 @@ static void process_chn_event(u32 relid)

do {
- hv_begin_read(&channel->inbound);
+ if (read_state)
+ hv_begin_read(&channel->inbound);
- bytes_to_read = hv_end_read(&channel->inbound);
+ if (read_state)
+ bytes_to_read = hv_end_read(&channel->inbound);
+ else
+ bytes_to_read = 0;
} while (read_state && (bytes_to_read != 0));
} else {
pr_err("no channel callback for relid - %u\n", relid);

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/